Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, 35-50(80) ft [11-15(24) m] tall, slow growing, broad pyramidal symmetrical shape, horizontal limbs small, usually with a short trunk and bark which is pale brown, flaky. Leaves alternate, simple, ovate to obovate, 6-15 cm long, acuminate tip, base cordate, margin serrate or crenate-serrate, dark green, pubescence on veins below; fall color pale yellow/green, sometimes purplish. Flowers; male catkins 5-8 cm long, female flowers small, inconspicuous. Fruit a nut, clustered, involucre about 4-5 cm wide, deeply divided into linear lobes, nut 12-16 mm across.
- Sun to light shad, best in well-drained soil. Considered a possibility for "difficult sites", tolerates drought and alkaline soil. Received the Royal Horticultural Society's Award of Garden Merit in 1993.
- Hardy to USDA Zone 4 Native to southeast Europe and western Asia.
- colurna: classical name